TFS heads milled to 58cc/compression ratio?

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Jul 12, 2008 | 09:26 PM

porsche914ls6

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TFS heads milled to 58cc/compression ratio?

I'm seriously considering dropping some cash on a pair of TFS 215cc heads for my 346 shortblock running Mahle pistons w/ 2cc valve reliefs. They are stock OEM 3.898 diameter. My question is this: What will my compression ratio be with milled TFS 215cc heads that currently have 58cc combustion chambers? Will I have any room left to clean these heads up on a mill in the future should they need it.

Jul 13, 2008 | 07:53 AM

porsche914ls6

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Anyone with 58cc chamber size... what is your compression ratio?

Jul 13, 2008 | 09:36 AM

purdueranger

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What thickness gasket are you going to be running. with a .040 thickness gasket it going to be in the 11.40 SCR range. this is a rough estimate so anyone who comes up with a more precise mesurement, feel free to correct my calculated number.

Jul 13, 2008 | 10:19 AM

Jordan S.

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I have 59CC trick flows with a .040 gasket and -4CC mahles. I'm at 11.2:1

Jul 13, 2008 | 10:31 AM

porsche914ls6

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I'll be using the stock 04 ZO6 MLS head gasket. I'm not sure how thick these gaskets are. Did you have any intake manifold fitment issues? I've read that GM likes to shorten the dowel pins to help mate the manifold more easily.

Last edited by porsche914ls6; Jul 13, 2008 at 10:38 AM.